Composite sealing heat treatment metal plug

Abstract

The end part of the metal plug is provided with a clamping groove and is paved with an asbestos layer so as to be matched and sealed with the end part of the steel pipe; the head part adopts a two-section conical design, the taper close to a sealing end face is 1.5-3 degrees, and the taper of the head part is 10-30 degrees; the sealing end of the plug is in interference fit with the inner wall of the steel pipe; the fastening sealing surface is slightly larger than the inner hole of the steel pipe in size; a stamping thread is arranged at the sealing position of the inner wall of the steel pipe, the length of the thread is 30-50mm, and an asbestos cord is wound in the thread; the center of the top of the plug is provided with an exhaust hole with the diameter phi of 5-10 mm, and the top of the plug extends into the steel pipe by 150-200 mm. A steel plate with the thickness of 5-10 mm is used for being integrally stamped and formed through a hydraulic die. The problem that water enters the inner surface of the steel pipe to crack can be effectively solved, the composite sealing effect is better than that of a traditional sealing mode, metal consumption is reduced, the device is relatively light, the labor intensity of workers is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of metal heat treatment and is a metal plug for composite sealing heat treatment of a matching mold. Background Art

[0002] During the tunnel furnace heat treatment quenching process, a loose seal on the steel pipe end face allows the quenching liquid to spray onto the inner surface of the pipe, resulting in uneven cooling inside and outside the pipe and causing quenching cracking. Subsequent processing requires resection of the cracked area, typically with a length of 800-1000mm, resulting in high metal consumption and significant cost.

[0003] There are two sealing methods in the existing technology: the first is to weld iron plates to the end faces of steel pipes. The disadvantage is that the welding requirements are high, there must be no pores, and it is easy to fall off during the heating and water quenching process, causing water ingress and cracking; the second is to use a conical steel plug to seal the end face of the steel pipe. The disadvantage is that the plug is manually knocked to make it fit the inner wall of the steel pipe. Due to the irregular inner hole of the steel pipe and the poor control of the manual knocking force, it cannot be completely sealed and is easy to get water in and crack. Utility Model Content

[0004] The utility model aims to provide a composite sealing heat-treated metal plug, which adopts a composite sealing method of inner wall fixed sealing and end face sealing to solve the problem of water ingress during the quenching process of steel pipes.

[0005] Technical solution of the utility model:

[0006] The composite sealing heat-treated metal plug has a groove at the end and is padded with an asbestos layer to make it fit and seal with the end of the steel pipe; the head is a two-section conical design, with a taper of 1.5~3° on the sealing end face and a taper of 10~30° on the head; the sealing end of the plug and the inner wall of the steel pipe adopt an interference fit, and the size of the fastening sealing surface is slightly larger than the size of the inner hole of the steel pipe; there is a stamped thread at the sealing position with the inner wall of the steel pipe, the thread length is 30~50mm, and asbestos rope is wrapped inside the thread; a φ5~10mm exhaust hole is opened in the center of the top of the plug, and the top extends into the interior of the steel pipe for 150~200mm.

[0007] The beneficial effects of the utility model are as follows: the composite sealing effect is better than the traditional sealing method, which can effectively solve the problem of water ingress and cracking on the inner surface of the steel pipe, reduces metal consumption, is relatively light, reduces the labor intensity of employees, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a cross-sectional view of a composite sealed heat-treated metal plug.

[0009] Figure 2 This is a cross-sectional view of the composite sealing heat-treated metal plug in use.

[0010] Figure 1Middle: 1-slot; 2-asbestos layer; 3-thread; 4-vent hole; 5-steel pipe; 6-fastening sealing surface. DETAILED DESCRIPTION

[0011] The following is a description of the embodiments with reference to the accompanying drawings.

[0012] Figure 1 As shown: Composite sealing heat-treated metal plug, made of 5~10mm thick steel plate through hydraulic die integral stamping. A slot 1 is set at the end and an asbestos layer 2 is laid to make it fit and seal with the end of the steel pipe; the head is conical design, using an interference fit. The size of the fastening sealing surface 6 that is interference fit with the inner wall of the steel pipe 5 is slightly larger than the inner hole size of the steel pipe 5. Its main function is to fix the plug to prevent it from falling off during heating and water quenching, and it also has an auxiliary sealing effect; a thread 3 is stamped at the sealing position with the inner wall of the steel pipe 5. The thread 3 is 30~50mm long and asbestos rope is wrapped inside the thread 3 to solve the problem of poor sealing caused by the non-round inner hole of the steel pipe 5; a φ5~10mm exhaust hole 4 is opened in the center of the top of the plug, and the top extends into the interior of the steel pipe 5 for 150~200mm to solve the impact of internal gas expansion on the sealing plug when the steel pipe 5 is heated.

[0013] Installation: This plug is pushed into the inner hole of the steel pipe 5 by a hydraulic cylinder, so that the plug fits against the inner wall, and the end groove 1 and the asbestos layer 2 match the end face of the steel pipe 5, playing a double sealing role.

[0014] Removal: Use hydraulic calipers.

Claims

1. Composite sealing heat-treated metal plug, characterized by: A slot is provided at the end and an asbestos layer is laid to make it fit and seal with the end of the steel pipe; the head is a two-section conical design, with a taper of 1.5~3° on the sealing end face and a taper of 10~30° on the head; the sealing end of the plug is interference fit with the inner wall of the steel pipe, and the size of the fastening sealing surface is slightly larger than the inner hole size of the steel pipe; there is a stamped thread at the sealing position with the inner wall of the steel pipe, the thread length is 30~50mm, and asbestos rope is wrapped inside the thread; a φ5~10mm exhaust hole is opened in the center of the top of the plug, and the top extends into the interior of the steel pipe for 150~200mm.

Images